Earnings Per Share (Reconciliation of Computation of Basic and Diluted Shares and the Related Impact on Income) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic EPS
Net income attributable to common stockholders	$ 784	$ (27,476)	$ (9,146)	$ (4,474)
Basic EPS, Weighted Average Shares (Denominator) (in shares)	121,074	120,751	121,065	120,637
Basic EPS, Per Share Amount (in usd per share)	$ 0.01	$ (0.23)	$ (0.08)	$ (0.04)
Effect of Dilutive Securities
Stock options (in shares)	1
Nonvested shares (in shares)	72
Contingently issuable shares (in shares)	233
Diluted EPS
Net income attributable to common stockholders	$ 784
Diluted EPS, Weighted Average Shares (Denominator) (in shares)	121,380	120,751	121,065	120,637
Diluted EPS, Per Share Amount (in usd per share)	$ 0.01	$ (0.23)	$ (0.08)	$ (0.04)